Tub



FIG. 1 is a top, front, right perspective view of a tub showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof, the right side being a mirror image.

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a tub, as shown and described. 